diff --git a/libavcodec/adpcmenc.c b/libavcodec/adpcmenc.c
index e500a1cdbf..82cd8b5992 100644
--- a/libavcodec/adpcmenc.c
+++ b/libavcodec/adpcmenc.c
@@ -137,7 +137,8 @@ static av_cold int adpcm_encode_init(AVCodecContext *avctx)
     }
 
     avctx->coded_frame = avcodec_alloc_frame();
-    avctx->coded_frame->key_frame= 1;
+    if (!avctx->coded_frame)
+        goto error;
 
     return 0;
 error: